Thread cutter for looms



Sept. v27, 1927'. 1,643,457

V. H. JENNINGS ET AL vTHREAD CUTTER FOR Looms Filed Dec. 26. 1924 2 sheets-snee@ 1.

Sept. 27, 1927. 1,643,457

V.- H. JENNINGS ET AL THREAD CUTTER FoRlLooMs Filed Deo. 26,- 1924 v 2 Sheets-Sheet 2 Zio '1:21 f1 y@ 4 ff Patented Sept. 27, 1927.

UNITED STATES PAT-ENT QF'FICE'.

vrcToR n. JEYNNIvNGs ann HERBERT Wasson, 0E WoRcEsTE'R, inassaonnsnmrs,

AssIGnoRs To cRoMPToE a KNoWLEs Looivr WoR-vigs, or vvoRCE,smeren,v MASSACRE- sETTs, A coRPoRArI'oN 0E Masstaon'nsnlrrs.

THREAD CUTTER EoR peores,

Application led December 26, 1,924. Serial No. 758,010.

This invention relates to a thread cutter capable of general application but particularly designed for use in an automatic shuttle changing loom. In such loom it is essential that the Wett be severed at the selvage as a substantially exhausted shuttle is ejected and also that theweft attached to the incoming shuttlebe severed at the selvage after the new` shuttle has been sent to the other end of the lay.

Itis the general object of ourinvention to provide a thread cutter for such purposes` which Will be normally inoperative,V but wheh will be reliable and efeieet When eperation thereof is desired at the time of Shuttle repleeeehf.leent-` A `further object is to provide a thread Cartel: Wheh will eet" e. thread Whe11. the cutter blade is moving in either of tivo directions. i

An important feature of the invention ref lates to provision for. ,co-operation between the Shuttle @hemelse meehenem eed the. thread cutter,V so, that the vlatter rendered' operative in timed relation to the operation of the Jformer. a

Our. invention urther relates to arrangements and combinations of part-s which Yvvill be hereinafter 'described` and more particularly Peieeed eef. ie .the appended eleilee- A preferred form of the invention is shoivn in the drawings in WliihY r Fig. 1' is apartial side elevation of a Shuttle ehehgee leere eelleedree 011e prevemente;

Fiel, 2 ie an enlarge@ Seele elereeen of certain parte shown-in Flag., l.; v

V Fig. 3 is an enlarged front elevation et the: parteeheaeiele-; i

- fis-."4 ie, e treat e,1..efe.tiee ef eeduieael Reife, ef the leeres Fie 5 is e plee view el? the three@ Gatter a- -Fe e ie, e. eide elevation thereof? leeleee in. the, .dieeetlea ef the anew 6 in. Free ,enel showing the eviter ie, iaeperetire poseen-s,

"Fife 7 ie e. View .Similar te Fie-6; hat shewae the eeteer ia re War-el Peelaee; Fig. 8 is a detail Seelonahview, taken along the line .818 aFie 6s eed, Fis, 9 ie. aaeelersee .ereee-eeeeee ef ene oftlieeeeea bleef., ,y l' p We t elena ariav/feeeen peep-lied. e, e. am .e leem. eff eheaae .reeel in the prior patent to Ryon, No. 1,476,847, issued December 11, 1923. ln this loom the running shuttle box 10 (Fig. 1) is mounted upon alifter rod 11 so that Vit can be'raised above the back box plate 12 to rearwardly eject a substantially exhausted shuttle, While a new shuttle is at the same. time lifted to that the lever 17-'Will raisethe litter rod' 11.

upon indication ,of weft exhaustion'. For` a more complete description of the mechanism for actuating the lifter rod "11 upon indication of shuttle change, referenceis made to the prior patent to Ryon,`above cited.

The shuttle changing mechanism may operate upon complete exhaustion "of the shuttle, under the control of a filling fork, or itv may operate upon substantial exhaustion of the shuttle, under the control of some usual type of Weit detecting mechanism. In the latter event, it is particularlynecessary that the old yweft extending from :the adja? cent Selvage to the` substantially exhausted shuttle should be severed as the shuttle 'is ejected and that the new weft extending from the end holder to the adjacent selvage should be severed, aftery thenewshuttle has been sent across the lay to the'opposite side ofthe loom, s*

Qur improved vthread cutter4 comprises a stand 2,0,r (Fig. 5) Vwhich issecured inadjustedrpfosition upon the loom frame 21; A slide `22 is mounted for forward and 'realey Ward mevement in the, stand 2o. ma is pressed yieldingly rearward by a spring 23, Pestened. between a fixed bearing 24 eed" e @011er 25 on the slide 22. A chain, cord, or ether flexible .eeeneeton 26, is. secured at v27 to the stand 22 and passes' over guide pulleys 28. (Eg- 6) and 29 (Fgel) .t0 ,e three-armed lever 30..

The lever- 301e riveted at 3,1. te e bracket .32 which securedy to the rock shift e. e 'pire-.e are@ ,a *e aimaient the lay le', .e pme jecting arm of the lever engages a nut 36 which forms a shoulder at the lower end of the lifter rod l1.` An adjustablescrew 37 is threaded in a lug in the side of the arm and engages the under side of the bracket 32, thus limiting upward movement of the arm 35. A weight 38 on the end ofthe third arm 39 ot the lever 30 counter-acts theV weight ot' the arm 35 and holds the screw 37 yieldingly against the bracket 36 when the litter rod is in raised position.

The parts are so connected that when the litter rod is in its normal or lower position, the arm 35 is depressed and the lever 30 is swung to the lett to place tensionupon :the ieXible connection 26 and withdraw the cut-- ter slide 22 toward the iront of the loom, to normal or inoperative position.` `When the litter rod ll rises at a changeot shuttles, thetension on the connection 26 is released and the spring 23 forces the slide 22 yieldingly toward the lay 40. i

Our improved thread cutter comprises a cutting plate 4l secured to the rearward end the upward or' the of the slide 22 but in spaced relation therefrom, as indicatedin 8. The plate 41 may be secured in any convenient manner as by screws 42 and 43, thescrew 42 acting also as a `pivot itor 'the movable cutter. A spring 45` (Fig. 5) on the screw 43 presses the cutter platev 4l irmlyagainst the movable cutter 44. The plate 4lhas a deep notch or recess 46 `formed at its rear end, both the upper and loweredges ot said recess co-operating with themoving cutter 44 to cut the weft. The cutter 44 is likewise provided with upper and lower cutting edges and is thus adaptedto cut the wett during either downward movement of the cutter.

Themovable cutter 44 has a plate 47 forming a forward extension thereof and having a cam slot 48 formed therein. The slot 48`is substantially L-shaped and receives a roll o r stud 49` mounted on a depending projection at the rear end of a bar or support 50, which is also slidable in the stand 20 and whiclris normally pressed rearward by a spring 51.`

Whenthe parts are in their normal "inoperative position, as shown in Fig.`6, the cam studor roll 49 is in the horizontal rearward portion of the slot 48. lVhile in this position, the wett extending to the substantially exhausted shuttle can `enter the recess46. "i V The stand 22 has a depending projection `53 which Ais positioned "to engage V,the front edge of the lay`40, whenever the slide 22 is released. `As the litter rod ll rises for the shuttle change, the slide 22 is'thus released and moves rearward with the lay 40.A During such movement the barl 50 andcam "stud 49 remain in fixed position and the stud is thuscaused to have relative forward travel alongthecam slot 48.

As the stud 49 reaches the upwardly inclined front portion of the slot 48, the cam plate 47 is swung aboutthe pivot 42 to the position indicated in Fig. 7, thus giving the cutter 44 an upward cutting` movement.

As the lay 40 thereafter continues itsrearward movement, the exhausted shuttle is ejected and a new` shuttle is placed in runningypcsition andis picked across to the opposite end of the lay.`

As the lay next moves forward, the wett from the new shuttle enters the recess 46. The lug 53 on the slide 22 is then engaged by the lay inits continued forward movement,'thus causing the stud 49 totravel in the `reverse direction along `the slot 48, returningY the parts to the position shown in Fig. G, and thus giving the cutter 44a downward -cutting movement.

By this time, the litter rod ll has returned to normal lowered position and the thread cutterwill beV thereafter retained in the position shown in Fig. 6 until another shuttle cli'ange'i-s indicated." iIt will benoted that the cam 14 is provided with aV concentric" outer surface of somwhat greater extent than is shown in the patent to Ryon, so that the time forV operation of thethread cutter may be correspondingly extended; l"

` Having thus described ,our invention "and the operation rthereof the advantagesV will be readily apparent. All ofthe parts arsenc'eedingly simple in construction and. the cutter is held inoperative during a very large portion ofthe period of operation of the loom. WVhen released at shuttle change,` the cutter has two successive operating- Vmovements in opposite directions, timed so ythat these movements'ivill successively sever the outgoing and the incoming Wett.

' While we havedescribed our invention as applied to a shuttle changing automatic loom,it will be evident that many features of our improved thread, cutter are available for general use and that they possess inanifest advantages when thus used.

Having thus' described our invention,fwe do not wish to be limited to the detailsherein disclosed otherwise than as set yforth in the*l clai1ns,fbut whatwe claimist-f Y 1.oIn a loom, a thread cutter having a cuti y ed for relativemovement onV said slide, a v

cam andcam plate co-acting to moveone of said blades, and a separate yielding support for one of said cam elements said support being additional to said slide.

4. In a loom,`a lay, shuttle changing mechanism, a. thread cutter, means to hold said cutter normally in forward position, means to release said thread cutter for rearward movement upon shuttle change, said cutter having a portion engaged by said lay to move said cutter 'forward and said thread cutter having a cutting movement on both rearward and forward movements thereof.

5. In a loom, a thread cutter comprising a cutting blade having` a recess with both its upper and lower edges formed as Cutting surfaces, and a second blade movable past said recess and having upper and lower cutting edges co-operating with said first blade to sever a weft inserted in said recess.

6. In a loom, a shuttle changing mechanism having a running shuttle box movable into and out of operative position, a thread cutter, and a connection between said shuttle changing mechanism and said thread cutter eective to hold said thread cutter withdrawn from cutting posit-ion so long as said shuttle box is in operative position.

7. In a loom` a shuttle changing mechanism having a running shuttle box movable into and out of operative position, a thread cutter, a connection between said shuttle changing mechanism and said thread cutter effective to hold said thread cutter withdrawn `from cutting position so long as said shuttle box is in operative position, and means to move said thread cutter to operative position when said running shuttle box is moved from operative position.

In testimony whereof we have hereunto aifixed our signatures.

VICTOR H. JENNINGS. HERBERT H. WATSON. 

